Securing throttle area in a coordinated torque control system

Abstract

An engine system includes a throttle actuator module and a torque control module. The throttle actuator module controls a throttle actuator based on a desired throttle area. The torque control module determines an actuator torque. The torque control module determines a rate limited torque, a maximum torque, and a minimum torque based on the actuator torque and a predetermined rate of change. The torque control module determines the desired throttle area based on the actuator torque when the rate limited torque is greater than the maximum torque. The torque control module determines the desired throttle area based on the actuator torque when the rate limited torque is less than the minimum torque.

1. An engine system comprising:
 a throttle actuator module that controls a throttle actuator based on a desired throttle area; and 
 a torque control module that determines an actuator torque and that determines a rate limited torque, a maximum torque, and a minimum torque based on said actuator torque and a predetermined rate of change, 
 wherein said desired throttle area is determined based on said actuator torque when said rate limited torque is greater than said maximum torque and when said rate limited torque is less than said minimum torque. 
 
     
     
       2. The engine system of  claim 1  wherein said desired throttle area is determined based on said rate limited torque when said rate limited torque is less than said maximum torque and greater than said minimum torque. 
     
     
       3. The engine system of  claim 1  wherein said predetermined rate of change is based on a vehicle acceleration threshold. 
     
     
       4. The engine system of  claim 3  wherein said vehicle acceleration threshold includes an acceleration of 0.18-0.2 g in a 200 millisecond time frame. 
     
     
       5. The engine system of  claim 1  wherein said actuator torque includes an electronic throttle control torque. 
     
     
       6. The engine system of  claim 5  wherein said electronic throttle control torque is based on a future torque to meet a driver torque request. 
     
     
       7. The engine system of  claim 6  wherein said torque control module determines said rate limited torque based on said future torque when said actuator torque is greater than said future torque. 
     
     
       8. The engine system of  claim 6  wherein said torque control module determines said rate limited torque based on said actuator torque when said actuator torque is less than said future torque. 
     
     
       9. The engine system of  claim 1  wherein said torque control module determines a corrected torque based on an estimated air torque, said rate limited torque, and said predetermined rate of change. 
     
     
       10. The engine system of  claim 9  wherein said torque control module determines said desired throttle area based on said corrected torque. 
     
     
       11. The engine system of  claim 10  wherein said torque control module determines a plurality of said desired throttle areas based on said corrected torque. 
     
     
       12. The engine system of  claim 11  wherein said torque control module determines said desired throttle area based on said plurality of said desired throttle areas. 
     
     
       13. An engine control method comprising:
 controlling a throttle actuator based on a desired throttle area; 
 determining an actuator torque; 
 determining a rate limited torque, a maximum torque, and a minimum torque based on said actuator torque and a predetermined rate of change; and 
 determining said desired throttle area based on said actuator torque when said rate limited torque is greater than said maximum torque and when said rate limited torque is less than said minimum torque. 
 
     
     
       14. The engine control method of  claim 13  further comprising determining said desired throttle area based on said rate limited torque when said rate limited torque is less than said maximum torque and greater than said minimum torque. 
     
     
       15. The engine control method of  claim 13  further comprising determining said predetermined rate of change based on a vehicle acceleration threshold. 
     
     
       16. The engine control method of  claim 15  further comprising determining said predetermined rate of change based on an acceleration of 0.18-0.2 g in a 200 millisecond time frame. 
     
     
       17. The engine control method of  claim 13  further comprising determining an electronic throttle control torque. 
     
     
       18. The engine control method of  claim 17  further comprising determining said electronic throttle control torque based on a future torque to meet a driver torque request. 
     
     
       19. The engine control method of  claim 18  further comprising determining said rate limited torque based on said future torque when said actuator torque is greater than said future torque. 
     
     
       20. The engine control method of  claim 18  further comprising determining said rate limited torque based on said actuator torque when said actuator torque is less than said future torque. 
     
     
       21. The control method of  claim 13  further comprising determining a corrected torque based on an estimated air torque, said rate limited torque, and said predetermined rate of change. 
     
     
       22. The engine control method of  claim 21  further comprising determining said desired throttle area based on said corrected torque. 
     
     
       23. The engine control method of  claim 22  further comprising determining a plurality of said desired throttle areas based on said corrected torque. 
     
     
       24. The engine control method of  claim 23  further comprising determining said desired throttle area based on said plurality of said desired throttle areas.